Mark DeRosa is batting just .194 following offseason wrist surgery and hasn’t been himself since first suffering the injury in the middle of last season, hitting .224 with a .293 on-base percentage and .374 slugging percentage in 83 games.
DeRosa is scheduled to be examined by a wrist specialist today after expressing his frustration with the injury during a radio interview yesterday:

I’m starting to question some things. I’m gonna get my wrist looked at. I’m not happy with the way I’m swinging the bat. I’ve gotten some pitches to drive over the last week or two that I’m just not getting to. I’m starting to wonder if it’s something physical. I mean, a slump can only last for so long. It seems like ever since I hurt this thing it’s been downhill.

DeRosa is 35 years old, so an age-based decline in ability is also possible, but he hit .277 with a .361 on-base percentage and .477 slugging percentage in the 216 games before suffering the injury. San Francisco handed out matching two-year, $12 million contracts to DeRosa and Freddy Sanchez this offseason, and just 30 games later they’re almost surely regretting both deals.

“San Francisco handed out matching two-year, $12 million contracts to DeRosa and Freddy Sanchez this offseason, and just 30 games later they’re almost surely regretting both deals.”
Since they signed Sanchez knowing he was injured, there is a real good chance they regretted his signing prior to his signing. Wrap your head around that one.